In the above we start from the assumption that the layer polarized Mott insulator at the weak Mott regime is a spinon Fermi surface state and then argue that the small \(x\)  regime naturally hosts neutral Fermi surfaces in both layers. Whether the assumption is correct is a hard problem both theoretically and experimentally. Although there are suggestive signatures of constant spin susceptibility at the \(x=0\)  limit in the MoTe\(_2\) /WSe\(_2\)  system[1]}, it is hard to prove or rule out the possibility of spinon Fermi surface in the \(x=0\)  sample because of the lack of the probe of neutral spin excitations. Our proposal at finite \(x\)  in the MoTe\(_2\) -hBN-MoTe\(_2\) /WSe\(_2\)  system is thus also a good test of the nature of weak Mott insulator at the \(x=0\)  limit.
